how can I loop through the payload and search within the same payload in another array with similar structure and alter matches - mule

Question

I have entered the payload as shown below, but I have to replace the values ​​of "labelnumber" with the similar number from the main line array with the matches "payload.lines.number = payload.notification.body.lines.number" that are inside the line array inside the notification element, can anyone help me how can we replace it.
input payload
{
"date": "2022-11-15T19:24:36.871Z",
"lines": [
{
"number": "123",
"labelnumber":"ABC",
"received": "2022-11-15T19:30:17.955Z"
},
{
"number": "456",
"labelnumber":"DFG",
"received": "2022-11-15T19:30:57.426Z"
},
{
"number": "789",
"labelnumber":"HIJ",
"received": "2022-11-15T19:31:49.042Z"
}
],
"notification":{
"body":{
"date": "2022-11-15T19:24:36.871Z",
"lines": [
{
"number": "123",
"labelnumber":"",
"received": "2022-11-15T19:30:17.955Z"
},
{
"number": "123",
"labelnumber":"",
"received": "2022-11-15T19:30:57.426Z"
},
{
"number": "456",
"labelnumber":"",
"received": "2022-11-15T19:31:49.042Z"
},
{
"number": "789",
"labelnumber":"",
"received": "2022-11-15T19:31:49.042Z"
},
{
"number": "789",
"labelnumber":"",
"received": "2022-11-15T19:31:49.042Z"
}
]
}
}
}
expected payload
{
"date": "2022-11-15T19:24:36.871Z",
"lines": [
{
"number": "123",
"labelnumber":"ABC",
"received": "2022-11-15T19:30:17.955Z"
},
{
"number": "456",
"labelnumber":"DFG",
"received": "2022-11-15T19:30:57.426Z"
},
{
"number": "789",
"labelnumber":"HIJ",
"received": "2022-11-15T19:31:49.042Z"
}
],
"notification":{
"body":{
"date": "2022-11-15T19:24:36.871Z",
"lines": [
{
"number": "123",
"labelnumber":"ABC",
"received": "2022-11-15T19:30:17.955Z"
},
{
"number": "123",
"labelnumber":"ABC",
"received": "2022-11-15T19:30:57.426Z"
},
{
"number": "456",
"labelnumber":"DFG",
"received": "2022-11-15T19:31:49.042Z"
},
{
"number": "789",
"labelnumber":"HIJ",
"received": "2022-11-15T19:31:49.042Z"
},
{
"number": "789",
"labelnumber":"HIJ",
"received": "2022-11-15T19:31:49.042Z"
}
]
}
}
}
As you can see in this example, I need to loop through the main row array and find the matches within the notification array and assign the corresponding value.
NOTE: maybe in the notification.body has many elements and I don't need to change them and I don't know the name of its elements, in this case it only has "date" but I need to keep them as they are.

Answer 1

With the update operator you can update only the keys that you want. This solution assumes that all the number values are defined in payload.lines.
%dw 2.0
output application/json
---
payload update {
case lines at .notification.body.lines -> lines map ((item, index) ->
item update {
case .labelnumber -> (payload.lines filter ($.number == item.number))[0].labelnumber
}
)
}

Answer 2

Converting reference line Array to Hashmap will help replace values efficiently instead of looping every time. Following code will work
%dw 2.0
output application/json
var lineMap = {(payload.lines map {
($.number) : $.labelnumber
})}
var modifiedLines = (payload.notification.body.lines map ((item, index) -> {
data : item mapObject ((value, key, dataindex) -> {
(key) : if (key ~= 'labelnumber') lineMap[item.number] else value
})
})).data
---
(payload - 'notification') ++
{
"notification":{
"body":{
"lines": modifiedLines
}
}
}
Update : with updated requirement body can have any fields
%dw 2.0
import * from dw::util::Values
output application/json
var lineMap = {(payload.lines map {
($.number) : $.labelnumber
})}
var modifiedLines = payload.notification.body.lines map ((item, index) -> item update 'labelnumber' with lineMap[item.number])
var body = (payload.notification.body - 'lines') ++ {lines : modifiedLines}
---
(payload - 'notification') ++
{
"notification":{
"body": body
}
}